Resistance, current, and power

Question

Answer 1

(1)

Step 1 :

Redraw the circuit.

Observe the diagram.

The resistor bipasses with short circuit.

So the resistor is neglected in the circuit.

The resistors and are in series.

Step 2 :

The resistors and are connected in parallel.

Total resistance is .

Solution :

Total resistance is .

Answer 2

(2)

Step 1 :

Circuit current .

Step 2 :

Find current running through .

Current Division Rule : .

Current running through is .

Solution :

Current running through is .

Answer 3

(3)

Step 1 :

Power dissipated across resistor is .

Find current running through .

Substitute corresponding values.

Current running through is .

Step 2 :

Power dissipated across resistor is .

Substitute corresponding values in the above equation.

Power dissipated on is .

Solution :

Power dissipated on is .